Lime-hydrating apparatus



ug. l, l923. 31,464,722

H; MISCAMFBELL LIME HYDRATING APPARATUS Filed Jan. 17, 1920 2 Sheets-Sheet 1 M6655: 25a/@wwf EAJMZZ 1920 2 SheefLS-Sheei'l 2 Iman/fof.' jcr .gme/L, ff

WN mw N. MN Y NN KN Filed Jan. 17.

M w m JM H MISCAMPBELL.

LIME HYDRATING APPARATUS QM mM Aug. 14, 1923.

Patented hugo llel, i923@ HUC-El MES'SCAMPBEF'L, @hl DULUTE,

Application tiled lannary Il?, 3:9559.

.To all fic/tom t may concern:

Be it' lrnown that l, HUGH Miscairrnma, a citizen of the United. States, residing at Duluth, in the county of St. Louis and State of Minnesota, have invented certain new and useful improvements in Lime-Hydrating Apparatus, of which the following is a speciiication.

This invention relates to a mining apparalo tus, and more particularly to apparatus for hydrating and mining lime. The heretofore known types 'of lime hydrators possess very objectionable features, in that large quantities of lime dust escapes to the outside of the lo mixing machine, and especially so when 1dumping the contents of the miner. also after it is thoroughly dried, the draft taires a quantity of the hydrate up the stach and scatters it over the surrounding neighbor- 2@ hood, which makes it bad for such hydrating plants to be located within the city limits or close proximity to dwellings, owing to the very disagreeable nature and damaing effccts of such dust. in fact, this o jection 25 of escaping dust, has prevented the installation of hydrators in various cities. ther objections in the old form of hydrator are its limited capacity, and its laclr of thorough mixing before leaving the machine. 'lhese 3@ 'objectionsl together with others not enumer ated, are entirely overcome in my improved hydrator forming the subject matter of the present invention.

Among the objects of my invention is to 235 eliminate the escape and scattering of dust outside of the hydrating apparatus; further to greatly increase the capacity and output of such apparatus; further to effect a more thorough mixing and cooling of the material fi@ being treated before leaving the machine; further to provide such a combinationand arrangement of parts that the material-and water can be added at one end, and bagged or conveyed to the baggin place from the 45 other; and such further o jects, advantages and capabilities as will later more fully apear. P 'llo the attainment of these ends, and the accomplishment of other new and useful obo@ jects, as will appear, my invention consists in the features of novelty in the construction, combination and arrangement of the several parts hereinafter more fully described, and SllOWIi in the accompanying drawings illus in which- ESEENNT'ST.. i

sensi no. scenic.

Fig. l is an elevation brolren away in for the salte of clearness, showing an apparatus embodying my invention.

- F ig. 2 is a vertical longitudinal section through the secondary mining device.

3 is a vertical tra sverse section through the secondary mining device on line lll ig. l is a section on lines il-1l of ig. 2.

lt has been found complete the operation of that to more successfully hydration, it is necessary that the material be subjected to the lt is further of before ba 'inoh j o the successful operation of this type of apparatus that the product be conveyed from the hydrator outlet to the bagging apparatus.

would not be feasible to carry out this entended mining and cooling in the heretofore lrnown types would require of hydrator, since to do so not only an apparatus of ein cessive size, but also a prohibitive number of such hydrators. ln my ll have combined all of features, and have improved hydrator these very desirable provided an apparatus ch combines the operations of nishing the hydration, sumciently cooling the same, and conveying the product to the delivery outlet, all in one device. my apparatus enables the At the same time doubling or more than doubling of the capacity of this class of machines.

Referring and more particularly to lT ig. l, it will be seen that my improved apparatus comprises the main or primary mining device P, for struction and arrangement the interior conof stirrin vices, of which reference is had to F nited States Letters Patent me @ctober l0, 1905.

or chamber l) is No. 801,329, issued to lfhe mixing apparatus provided with a suitable stack l, and the weighing and charoing apparatus 2, which nected to scales 3 to be charged i There is also yas shown is suita ly for weighing the material nto the provided a source 'of water supply 3a, and suitable pipes l, which la the mining chamb form' of construe conprimary mixer.

sprinkling or discharging tter are positioned within er, and are of any suitable ion for adding a desired same comprises an elongated drum 11,

quantity of water to the lime being treated.

Suitable driving mechanism 5 1s providedv for rotating the mixer, and the operation and control 'of the interior stirring devices may readily be effected from the exterior by control mechanism 6.

The mechanism thus far described may be suitably mounted on girders or other supporting members 7, on the level of floor 7 a.

elow the mixing device P., and suitably secured thereto, vis the hopper or bin 8, which is provided at its lower end with afeedin device 9, the function of which is to fee the material being treated from the lower part of hopper 8, into chute 10, from which it passes into the secondary mixing devices, alsovreferred to hereinafter as a combined mixer and conveyer; it being understood, of course, that the amount of material fed into vthe secondary mixer S may be controlled as desired by feeder 9.

Referrmg now to the construction of the secondary mixer or combined mixer and conveyer S, it will be seen from Fig. 2 that thfe pre erably cylindrical in cross section, and having secured to the inner face of its cylindrical shell, the helical flights 12 which as shown, extend substantially the full length of drum 11, and are in width of a dimension less than the radius of the drum. The

drum 11 is provided adjacent each end thereof, and secured thereto, with the annular flanges 13, each having a flat outer periphery lato serve as a trackway for movement over the rollers 15, rotatably 1 mounted in a suitable frame 16, and which arrangement, as will be readily understood, permits rotation of drum 11 upon rollers 15 when suitable power is applied thereto. Also secured upon the exterior of drum 11, is the dange 17, carrying gear teeth 18, adapted to be rotated by pinion 19, carried on shaft 20, rotated by a train of gear mechanism, comprising gear 21, secured upon shaft 20, and meshing with pinion 22 fixed on shaft 23, which shaft also carries belt pulley 24 for operation by a belt, or other suitable means for connecting the same to a source of motive power. 1t is to be understood, of course, that the frame members 16, and the train of gear mechanism for operating toothed ange 17, are suitably mounted upon appropriate foundation construction or supports, to hold the same in operative position with relation to the drum. Longitudinal movement of drum 11 is prevented by the rollers 25 and 26 rotating in a-horizontal plane and contacting with the opposite vertical sides of one of the annular flanges or trackways 13. The end 27 of drum 11, has an aperture 28 therein, through which is adapted to extend the discharge spout 29 of the chute 10, leading from feeder 9. 'Encircling end 29 and conrace-,vea

tacting with end 27 of the drum, is a suitable disc or closure 30, to prevent the escape of dust, and the like, from the interior of drum 11. The end 31 of the'drum is open, and passes through an opening in a closely fitting sealing member 32 covering an opening in casing 33, which serves as a delivery chute to suitable elevator mechanism (not shown in detail) mounted in the elevator casing 34:, and which elevator serves, in case it is not desired to bag the hydrated material atv the end of drum 11, to convey the same to anyv suitable bagging mechanism at a more or less removed position.

1n the operation of my improved apparatus, the lime is fed into the primary mixing device l?, from hopper 2, and a suitable amount of water added thereto through the sprinkling pipe 4. vice P is then rotated by driving mechanism 5, for a suitable length of time, after which its contents are dumped into the hopper 8, from which they will be fed by feeder 9, through chute 10 and spout 29, into the adjacent end of drum 11, which drum is suitably rotated as described above. 1t b`eing understood that the speed of rotation of the drum will be sufficiently slow to enable thorough and complete treatment of the material before being discharged from The primary mixing dethe opposite end of the drum. As the drum rotates the material is agitated by being turned over and over, and dropped from the sides of the drum to its lower portion, which continued operation, due to the helical formation of ights 12, will simultaneously with the agitation and mixing of the hydrate, carry thesame towards the delivery end 31 of .the drum, and by the time the product reaches the latter end. it will he thoroughly mixed and sufficiently cooled to permit of the same being bagged.

1t is of importance tion of drum 11 differs very materially from the ordinary spiral conveyer,the function of the latter being merely to push the materials longitudinally of the conveyer. 1n my combined mixer and conveyer," the material is as explained above very completely and thoroughly mixed, by being carried circum- :ferentially with the drum as it rotates, until the material reaches a point at which it will drop downwardly to the lower portions of the drum, and be simultaneously worked forwardly toward end 31 of the drum by the spiral arrangement of Hights12..

By this arrangement the time that would otherwise be required for the treatment of the material in the primary mixer l?, is very greatly lessened, and the'latter may be kept more continually in operation and more freuently charged, due to its contents being umped at shorter intervals into hopper 8, and their more edective treatment, compristo note that the operaiet 'a hydrating apparatus,

Meat/aa veying of the same in the secondary mixing device S, the operation of which, as will readily be understood, can be carried on simultaneously with the operation of primary mixer P.

It will thus be seen that I have provided the capacity of which 1s more than double Vthat of the primary mixing device P, considered alone, and that I amA enabledto `more thoroughly and completely mix the materials being treated, and simultaneously therewith cool and convey them to a point for baggingyall of these op-V erations being carried out without the escape of lime dust or other disagreeable materials, to the surrounding neighborhood, as a result of which my apparatus can be successfully and satisfactorily operated with in the city limits, or in more or less congested neighborhoods.

`While I have described my apparatus as vespecially adapted for hydrating lime, I desire it to be understood that the same is susceptible of treatment of other materials, in which the objects to be attained are more or less similar to those pointed out above. Also while I have illustrated a preferred embodiment of my invention, I desire the same to be understood as illustrative only andnot as limiting the scope of my invention.

aving now described my invention, I claim:

l. In lime hydrating apparatus, a primary mixing mechanism adapted to receive lime and water in predetermined quantities and mix the same, means to periodically deliver to said mechanism predetermined quantities of lime, means to periodically deliver to said mechanism predetermined quantities of water, a-secondary mixing apparatus for thoroughly completing the mixing of the said materials, said secondary mixing apparatus comprising an elongated .drum having means for repeatedly agitating the material being treated and moving -it from one end of the drum to the other, Said means comprising helical flights extending substantially the length ofthe drum, and mechanism for rotating said drum, and means for controlling the delivery of the' material from the primary to the secondary mixer.

2. In lime hydrating apparatus, a primary mixing device adapted to receive a batch of lime and water 1n desired proportions, a

hopper below said mixing device adapted to receive the contents thereof after treatment therein, a combined conveyer and finishing 'device at a lower level than the primary device, into which the material passes from the hopper, said last mentioned device comprising an elongated rotatable drum having on its interior means for simultaneously agitating and moving longitudinally of the drum said material being treated.

Y 3. In lime hydrating mixing device adapted to receive `batches ot lime and water in desired proportions, a hopper below said mixing device adapted to receive the contents thereof after treatment therein, a combined conveyer and linishing device at a lower level thanthe primary device, into which the material passes Jfrom the hopper, said last mentioned device comprising an elongated rotatable drum having on its interior means for simultaneously agitating and moving longitudinally of the drum said material being treated, and means for rotating said drum, to cause the material to be advanced.

4. In lime hydrating apparatus, a primary mixing device, a combined conveyer and finishing device, and a connecting between said parts, said conveyer and finishing device comprising a drum having a con tinuous flight arranged helically along the Vinterior thereof, said Hight being of( less width than the radius of the drum, and closed means intowhich said drum discharges its cooled and thoroughly mixed contents, to be bagged without substantial passageway apparatus, a primary o5 esca e of dust means bein1 rovided around the drum where it enters the said closed means tohentirely close the opening between thetwo.

5. In lime hydrating apparatus, a primary mixing device, a weighing device for introducing a known quantity or lime into said primary mixing device, a water supply and sprinkling device for adding a desired quantity of water to the lime in said primary mixing device, a hopper below said mixing device to receive the contents thereof, and a combined conveyer and finishing device into which said hopper discharges.

In witness whereof, I hereunto ,subscribe my name to this specification.

HUGH MISCAMIBBEIJIL. 

